Make RustRaptor the repository root and track its playable bundle

mods/iron_coast_campaign/README.md

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+# Iron Coast — Complete Campaign
+
+Enable this optional assembly package in **Mods** to select all six Iron Coast
+mission packages and their shared weapon and enemy dependencies. Review the
+selected packages and apply changes from the main menu, then choose **Iron
+Coast 1 — Breakwater** in mission selection to start the route.
+
+Each mission is a separate mod. A mission can be enabled and played without
+this campaign package. The assembly package changes campaign progression;
+gameplay, generated SD/HD artwork, sounds, distinct stage bosses, the original
+Iron Coast soundtrack and scripts remain in the mission and content packages.
+Classic foes reference the original catalog's enemy definitions, retaining
+their native flight paths and firing behavior.
+
+The campaign portrait reuses Mission 1's generated briefing artwork, included
+here so this package owns all artwork it references. Original game assets are
+not copied into this mod.
+
+See [the campaign guide](../../docs/iron-coast.md) for objectives, equipment
+loans, controls and validation results. All packages use mod API 1. Exact
+versions and package hashes are recorded in pilot saves.